EP0661835A3 - Digital radio communication system - Google Patents

Digital radio communication system Download PDF

Info

Publication number
EP0661835A3
EP0661835A3 EP94120692A EP94120692A EP0661835A3 EP 0661835 A3 EP0661835 A3 EP 0661835A3 EP 94120692 A EP94120692 A EP 94120692A EP 94120692 A EP94120692 A EP 94120692A EP 0661835 A3 EP0661835 A3 EP 0661835A3
Authority
EP
European Patent Office
Prior art keywords
demodulated data
quality degradation
line quality
signal
demodulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94120692A
Other languages
German (de)
French (fr)
Other versions
EP0661835B1 (en
EP0661835A2 (en
Inventor
Yuzo C/O Nec Corporation Kurokami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP0661835A2 publication Critical patent/EP0661835A2/en
Publication of EP0661835A3 publication Critical patent/EP0661835A3/en
Application granted granted Critical
Publication of EP0661835B1 publication Critical patent/EP0661835B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Noise Elimination (AREA)
  • Radio Transmission System (AREA)

Abstract

A digital radio communication system includes a first demodulator (33a), a second demodulator (33b), a non-break switch (34), and a switching controller (35). The first demodulator receives a signal from a first antenna and outputs demodulated data and a line quality degradation signal. The second demodulator receives a signal from a second antenna and outputs demodulated data and a line quality degradation signal. The non-break switch receives the demodulated data output from the first and second demodulators and selects and outputs one of the demodulated data. The switching controller receives line quality degradation signals output from the first and second demodulators to output a switching control signal to the non-break switch on the basis of the received line quality degradation signals. The first and second demodulators output the line quality degradation signals before the demodulated data are set in an interrupt state when abrupt frequency selective fading occurs.
EP94120692A 1993-12-28 1994-12-27 Digital radio communication system Expired - Lifetime EP0661835B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP33426193 1993-12-28
JP5334261A JP2699850B2 (en) 1993-12-28 1993-12-28 Demodulator
JP334261/93 1993-12-28

Publications (3)

Publication Number Publication Date
EP0661835A2 EP0661835A2 (en) 1995-07-05
EP0661835A3 true EP0661835A3 (en) 1998-07-22
EP0661835B1 EP0661835B1 (en) 2001-07-11

Family

ID=18275369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94120692A Expired - Lifetime EP0661835B1 (en) 1993-12-28 1994-12-27 Digital radio communication system

Country Status (4)

Country Link
US (1) US5535248A (en)
EP (1) EP0661835B1 (en)
JP (1) JP2699850B2 (en)
DE (1) DE69427682T2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08340279A (en) * 1995-04-13 1996-12-24 Sanyo Electric Co Ltd Spread spectrum communication method and equipment therefor
EP0804001B1 (en) * 1996-04-23 2005-03-09 Hitachi, Ltd. Self-healing network, method for transmission line switching thereof, and transmission equipment thereof
JP3286189B2 (en) * 1996-11-14 2002-05-27 松下電器産業株式会社 Receiver using algorithm diversity
SE0102395D0 (en) * 2001-07-04 2001-07-04 Bomill Ab A new method
JP4327021B2 (en) * 2004-05-21 2009-09-09 三菱電機株式会社 Receiving machine
JP4730515B2 (en) * 2005-02-02 2011-07-20 日本電気株式会社 Line alarm detection device, line alarm detection method and program
US7458139B2 (en) * 2006-09-22 2008-12-02 Kyokutoh Co., Ltd Tip dresser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095165A2 (en) * 1982-05-21 1983-11-30 Nec Corporation Space diversity receiving system for multi-direction time division multiplex communication
EP0271149A2 (en) * 1986-12-11 1988-06-15 Siemens Plessey Electronic Systems Limited Troposcatter modem receiver
US4972434A (en) * 1988-03-18 1990-11-20 Alcatel N.V. Receiver for a space diversity radio transmission system, the receiver including a diversity combiner
US5203027A (en) * 1989-11-14 1993-04-13 Kabushiki Kaisha Toshiba Diversity receiver for equalizing a data signal distorted in a signal transmission route

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60212048A (en) * 1984-04-06 1985-10-24 Nec Corp Code correcting type switching system
JPH0683127B2 (en) * 1985-07-22 1994-10-19 日本電気株式会社 Diversity receiver radio
US4752969A (en) * 1986-01-16 1988-06-21 Kenneth Rilling Anti-multipath signal processor
JPH07120977B2 (en) * 1987-09-16 1995-12-20 松下電器産業株式会社 Optical coupling device
JPH0276320A (en) * 1988-09-13 1990-03-15 Miyakawa Seisakusho:Kk Constant setting device
JPH0379130A (en) * 1989-08-23 1991-04-04 Fujitsu Ltd Space diversity receiver
JPH04130829A (en) * 1990-09-21 1992-05-01 Clarion Co Ltd Diversity receiver
JPH04291830A (en) * 1991-03-20 1992-10-15 Fujitsu Ltd Diversity reception system
US5214675A (en) * 1991-07-02 1993-05-25 Motorola, Inc. System and method for calculating channel gain and noise variance of a communication channel
JPH0677867A (en) * 1992-07-09 1994-03-18 Fujitsu Ltd Diversity reception circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095165A2 (en) * 1982-05-21 1983-11-30 Nec Corporation Space diversity receiving system for multi-direction time division multiplex communication
EP0271149A2 (en) * 1986-12-11 1988-06-15 Siemens Plessey Electronic Systems Limited Troposcatter modem receiver
US4972434A (en) * 1988-03-18 1990-11-20 Alcatel N.V. Receiver for a space diversity radio transmission system, the receiver including a diversity combiner
US5203027A (en) * 1989-11-14 1993-04-13 Kabushiki Kaisha Toshiba Diversity receiver for equalizing a data signal distorted in a signal transmission route

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHUANG J C -I ET AL: "A HIGH PERFORMANCE DIVERSITY SELECTION TECHNIQUE FOR TDMA PORTABLE RADIO COMMUNICATIONS", COMMUNICATIONS TECHNOLOGY FOR THE 1990'S AND BEYOND, DALLAS, NOV. 27 - 30, 1989, vol. VOL. 3, no. -, 27 November 1989 (1989-11-27), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1361 - 1365, XP000091219 *

Also Published As

Publication number Publication date
DE69427682D1 (en) 2001-08-16
JP2699850B2 (en) 1998-01-19
DE69427682T2 (en) 2001-11-22
JPH07202853A (en) 1995-08-04
EP0661835B1 (en) 2001-07-11
US5535248A (en) 1996-07-09
EP0661835A2 (en) 1995-07-05

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